Originally Posted by suzeeq

Okay, take your gauge of 5½ times 33½" and that's just over 184 sts. Find a smaller size that's closest to the same number of sts just below the underarms, at the bust, and use those stitch numbers to knit by. Knit the lengths  body, sleeves, armhole  to the lengths given for the size 39 though.

OK, I understand your math but for the next two smaller sizes here's what I figured: Size 32 = 196 sts; Size 29 = 172 sts. A total of 12 sts difference on each size. Which should I use? I'm still a little lost here.